We've never received report about such error. But we will try to find out what could caluse that. The most difficult is that as you mentioned this errors happens sometimes. If you could create a sample project that reproduces this problem all the times please send it to us and we will try find the reason for that.
Thank you.

Yes, I have a similar problem with XE5. It seems to have occurred since I moved to Update 2. On creating a new Data Snap Server, or anything with a data module, Delphi will crash. Removing TsiLang solves the problem.

I wondered if it was down to the dcus being compiled for an earlier version of XE5, and am hoping the latest build fixes it? (I have the DCU only subscription).